205603 has 2 divisors, whose sum is σ = 205604. Its totient is φ = 205602.

The previous prime is 205589. The next prime is 205607. The reversal of 205603 is 306502.

205603 is nontrivially palindromic in base 4 and base 16.

205603 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205603 - 2¹⁷ = 74531 is a prime.

205603 is an undulating number in base 16.

205603 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (205607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102801 + 102802.

It is an arithmetic number, because the mean of its divisors is an integer number (102802).

2²⁰⁵⁶⁰³ is an apocalyptic number.

205603 is a deficient number, since it is larger than the sum of its proper divisors (1).

205603 is an equidigital number, since it uses as much as digits as its factorization.

205603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 205603 is about 453.4346700463. The cubic root of 205603 is about 59.0214419815.

It can be divided in two parts, 205 and 603, that added together give a palindrome (808).

The spelling of 205603 in words is "two hundred five thousand, six hundred three".